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Chem Quiz #4

# Chem Quiz #4 - i ID Name NSCE HOUqubg/DCHEM-Zl3ID 00d...

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Unformatted text preview: i . ID Name NSCE HOUqubg /DCHEM-Zl3ID# 00d}? March17,2008 Dr. Miertschin CHEM—213 Quiz #4 — Buffers Please show your work for full credit. Use correct units and appropriate number of signiﬁcant ﬁgures and circle or box your answers. All problems refer to aqueous solutions at 250°C. 1. Disinfectant solutions for medical equipment sterilization may contain a mixture of hypochlorous acidiHClvG, and sodium hypochlorite, NaClO. The Ka of hypochlorous acid is 3.0 X 10'8. Calculate the pH of a solution made from 0.063 M HClO and 0.075 M NaCiO. P [F] : __ I 0.9 464 Mam/‘0‘? [Hg %%,J : MW: 252x10“3:2.§-></L7“W a . , 0:07? W . 5 0.075 2. Calculate the pH aftsr 0.015 mol of NaOH is added to 1.0 L f the solution in #1 above. “HOW OHl-‘aqlw as (10% (4206.4) 0.093 0.015" 0.075 woo ““0015 +0.05 0.0%? O 0(090 PH: Clojtimw‘?) H09 {ﬁe} ‘ 752+O.27: 7.7? / Equations & a Constant [base] pH = —Iog[H3o*] Kw = 1.0 x1044 @ 25°C Kw =Ka - Kb PH : PKa + log [acid] ...
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